Device for slaking lime and drying artificial stones, &amp;c.



Patented Dec. ll, IBOU. W. OLSCHEWSKY. DEVICE FOR SLAKING LIME AND'DBYING ARTIFICIAL STONES 8w.

(Application filed Dec. 2, 1899.)

(No Model.)

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UNlTED STATES rFicE.

\VILHELM OLSCHEWSKY, OF BERLIN, GERMANY.

DEVICE FOR SLAKING LIME AND DRYING ARTIFICIAL STONES, &c.

SPECIFICATION forming part of Letters Patent No. 663,459, dated December 1} 1900.

Application filed December 2, 1899. Serial No. 739,035. (No model.)

T0 at whont it may concern.-

Be it known that LWILHELM OLsoHEwsKY, a subject of the Emperor of Germany, residingatKess'elstrasse, No. 31, Berlin, Germany, have invented certain new and useful linprovemeuts in Devices for Slaking Lime and Drying Art i ticial Stones and the Like,of which the following is a specification.

This invention relates to a device for use in dry-slaking lime and in drying artiiicial stones and the like.

In manufacturing artificial stones of any kind of lime-mortar they are usually placed one upon another on a truck, which is then pushed into the drying-chamber or heatingfurnace in order to allow the stones to harden; but when such stones are placed one upon another the under-most layers are in many cases crushed by the weight of those above them before they have time to sufficiently dry to withstand such pressure.

The purpose of the present invention is twofold-namely, to give to the artificial stones a preparatory warming and partial drying sufficient to give them enough coherence that they do not become crushed by the weight of those above them when they are placed in the drying-chamber proper or heatingfurnace and to utilize them as a part of the apparatus by which the dry-slaking of lime may be carried out in a closed vessel without dangerous rise of tension therein.

The annexed drawingsillustrate in Figure 1 a sectional view of the improved truck, showing stones arranged thereon. Fig. 2 is a sectional view of a modified form of said truck.

This invention consists in placing under the platform of the truck one or more chambers into which steam can be introduced or in which steam can be developed for the purpose of warming the truck, and so giving a preparatory drying to the layers of stones which are immediately in contact with the upper surfaces of the truck, so as to enable them to more easily bear the load of the up per layers of stones. In the example shown in Fig. 1 the truck consists of a chamber a on wheels, having a cover I), which may be closed air-tight. This cover I) is hinged at d and is formed in two halves, resting when closed upon the cross-beam c. If steam is to be introduced into thischamber, a pipe 6 is arranged, through which steam enters the interior of the chamber. The cover I) is then heated by the steam thus let into the chamber, and the nndermost layer of stones (marked f) will become sufficiently dry on the outside to form a solid crust, so that they will not be crushed by the upper layersff of stones; hut in order to use the condensed steam collected in the chamber a this chamber can be used for the dry-slaking of lime. For this purpose lime to be slaked is spread on the bottom of the chamber a, the covers I) are then closed, and the first layer of stones f is placed on the cover. Steam is then introduced through the pipe 6 and acts in the following manner: It conveys heat to the cover Z), and thus partially dries the stones f in contact with the cover. Part of the steam condenses on the line g and on the inner walls of the chamber CL and on the cover I). From the latter the water drops upon the lime beneath, while that condensed on the walls also runs down and mixes with the under part of the body of lime. The condensed water is thus equally distributed over and through the lime in a finely-distributed state, thus producing the dry-slaking of the lime without any sudden increase of pressure, as takes place in other processes. A quantity of lime can be so chosen that after the preparatory warming and partial drying of the stones f is sufficiently advanced. the lime also is entirely slaked. The heat developed in the slaking of the lime in this device also assists in drying the stones. If such exterior means of removing the heat were not present, the heat due to dry-slaking would raise the tension in the chamber so far as to produce danger of explosion. The placing of the wet stones on the cover of the vessel has therefore the twofold object of drying the stones and enabling dry-slaking of lime in a closed vessel. When this preparatory or partial drying is finished, the truck, with the stones thereon and the lime within it, is placed in the drying-chamber or other device Where stones are hardened.

Where a larger quantity of lime is to be slaked during the warming and preparatory partial drying of the stones, the chamber Cb can be made, as shown in Fig. 2, so that it is deeper near the middle, and in this deeper part a stirring device 75 of any form may be arranged, so that the lime may be agitated 0r stirred up during the process of slaking. In the construction shown in Fig. 1 such stirring device is not necessary, as the layer of lime is only of small thickness. The action and effect of the device represented in Fig. 2 is the same as of that in Fig. 1.

I declare that what I claim is- 1. A device of the character described, consisting of a truck, the body of which is formed ofa chambera for receiving lime and having a movable cover Z) adapted to be closed airtight, and means for inlet of steam into said chamber at, its cover Z7 forming a platform on which artificial stones are placed, to withdraw heat from the chamber and its contents and 

